If you have a short attention span and are easily distracted ... some suggestions could be to ...
Stating a purpose to 'want' to read helps. Have you ever tried reading a book you did not want too? Chances are you quickly put it down within a few minutes because there is no 'drive' to 'want' to read!
During the PR stage, when affirming, state "As I photoread, my concentration is absolute" Saying is one thing, believing the importance of this statement is another. When stating the above ... envision yourself PhotoReading with absolute concentration.
Know that tilting of head and flipping of pages helps to keep state.
Most importantly, I'll say it again. Most importantly go easy on yourself and have fun with the process ... success is the result of continuously trying!!!